Spark-arrester.



P. c. SACCHGGIG & F. A. LAGRANGE.

SPARK ARRESTER.

APPLICATION HLED AUG.28. i918.

Patented Jan. 14,1919.

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P. C. SACCAGGIO & F. A. LAGRANGE.

SPARK ARRESTER.

APPLICATION FILED AUG-28. I918.

Patented 3211114,].919.

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PEDRO (IfETLESIILIILWJ SACCAGGIO AND FEDERIGO ALEJANDRO IIAGRANGE, 013 BUENOS AIRES, ARGENTINA.

SPARK-ARRESTER.

Specification of letters Patent.

Patented Jan. 14, 1919.

Application filed August 28, 1918. Serial No. 251,862.

To all whom it may concern."

Be it known that we, PEDRO CnLns'rINo SACGAGGIO and lfinnnnioo ALEJANDRO LA- GRANGE, residing at Buenos Aires, Argentina, have invented certain new and useful Improvements Relating to Spark-Arresters; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

This invention relates to rotary spark arresters for use with steam locomotive, or stationary, engines to prevent the scattering of hot cinders. The invention relates more particularly to spark arresters of the kind in which a cylindrical, conical or other suitably shaped screen of wire mesh or perforated metal is rotatably mounted immediately below and with its upper end in communication with the inner or intake end of the funnel or outlet for the gases of combustion and exhaust steam, the blast pipe and blower delivering steam into the lower end of the said screen the steam acting on a mum ber of driving or propelling blades or vanes within the screen.

According to this invention there is provided at, or near, the lower end of the arrester, and close to and above the blower ring at the top of the engine exhaust or blast pipe, a driving or propelhng device consisting of an annular series of short, or relatively short, driving or propelling blades or vanes, said blades being of suitable form or pitch and sloping upwardly at a suitable angle; these blades are surrounded,and preferably inclosed,at their outer edges by a ring which may be cast integrally with the blades, or the said blades may be inclosed at both their inner and outer edges by inner and outer rings which may be cast integrally with the blades. This device is suitably secured, preferably in a readily detachable manner, 'to a suitable member or members of the rotatable frame to which the wire mesh screen is attached.

in one construction according to this invention the driving or propelling device is similar to a bucket wheel, having upwardly sloping blades. which are situated between or embraced by inner and outer rings, and the construction and arrangement may be such that the blades are acted upon only by steam from the blower in which case a suitable number (for instance four) orifices or ports, set at a suitable angle for directing the steam on to the oppositely set or sloping blades of the bucket wheel, are provided in the blower ring between the inner edge or periphery of the said ring and the usual holes in the ring for emission of blower steam.

In another construction according to this invention the driving or propelling blades of the above mentioned annular series or ring of blades are formed or arranged so as to project inwardly beyond the edge of the outlet orifice of the blast pipe to such an extent as to be in the path of the exhaust steam escaping from the blast pipe and to be acted upon by the exhaust steam for giving the requisite rotary motion to the spark arrester or a second annular series or ring of propelling blades may be provided,-preferably formed integral with the aforesaid ring of blades in the form of a bucket wheel, the blades of this second ring or annular series of blades projectingto the required extent beyond the edge of the outlet orifice at the top of the blast pipe so as to be in the path of the escaping exhaust steam.

Further according to this invention the above mentioned annular series or ring of blades is provided with a laterally projecting ring or flange, or with a number of laterally projecting arms or lugs, preferably formed integrally with the ring embracing V Vice is provided with blades arranged so as to be acted upon only by blower steam (as above mentioned), the usual or any suitable arrangement of propelling or driving blades, to be acted upon by exhaust steam from the engine blast pipe, would also be provided; for instance propelling blades as described and shown in the specification of United States Patent No. 1,264,865, granted April 30, 1918, might be employed.

Further, the invention consists in the parts constructed and combined substantially as hereinafter described with reference to and illustrated in the accompanying drawings in which,

Figure 1 is a vertical cross section through one form of spark arrester according to this invention.

Fig. 2 is a sectional plan of Fig. 1 taken on, the line AA.

Fig. 3 is a vertical cross section through an alternative form of spark arrester according to this invention, as hereinafter described.

Fig. 4 is a sectional plan of Fig. 3 taken on the line BB, and

Fig. 5 shows enlarged detail views of the driving or propelling device shown in Figs. 3 and 1.

Like reference numbers refer to corresponding parts in the several figures of the drawings.

Referring to Figs. 1 and 2, the main details of the spark arrester or driven means are generally in accordance with that described in the aforesaid prior specification of United States Patent No. 1,264,865, granted April 80, 1918, 1 being the cylindrical casing of the vertical bearing from which radiate stays 2 connected at their outer ends to the upper ring or flange 3 of the rotatable frame carrying the conically .shaped wire mesh or perforated. metal screen 4: which is. suitably secured at its upper end to the ring 3 and at its lower end to the bottom ring 5 of the frame. 6 are further stays which in this case form inclined curved blades radiating from the c lindrical bearing casing 1 and which are suitably connected to or formed integrally with vertical stays or supports 7 which are suitably secured at their upper and lower ends respectively to the rings 3 and 8 is the bottom of the chimney petticoat pipe and 9 the blast pipe top. 10 are circular wire rings which are secured to the framing stays 7, the spark arrester screen 4 being suitably attached to the said rings 10.

As shown in the drawings the blast pipe top 9 is provided with an annular chamber 11 forming a blower ring andrsurrounding the blast pipe opening 12, the steam pipe from the blower valve communicating with said chamber 11 through the union 13. 14

are the ordinary blower holes leading from the chamber 11 which are placed equidistant from the center of the blast pipe and near the outside of the blower ring; in addition to the holes 1-1 a desired number of holes 15' lead from the aforesaid chamber (blower ring) 11 their position being somewhat nearer the blast pipe center. These holes 15 are not vertical as are the holes let but are inclined as shown at a suitable angle to direct jets of blower steam against a number of oppositely inclined blades 16 of the driving device which as shown is similar to a bucket wheel and comprises inner and outer rings 1'7 and 18 respectively with a number of the aforesaid inclined blades 16 suitably situated between and attached to (as shown formed integrally with) the said rings 17 and 18. This bucket wheel with its blades may be formed in one piece, for instance by casting, or it may be built up in any suitable manner. As shown in the drawings, Figs. 1 and 2 it is a casting and of such dimensions that while the steam from the inclined holes 15 acts upon its blades 16 to revolve it the main blower steam ejected through the holes 14 passes outside of the outer ring 18 clear of the driving or propelling device. 19 is a ring or flange surrounding the blast pipe top 9 and suitably secured to the bucket wheel by web pieces 20 or it may be formed in one casting with the outer ring 18 of the bucket wheel. This ring 19 provides means for securing the driving device to the frame of the spark arrester, for instance as shown to the bottom ring 5 of the frame, by means of bolts and nuts 21, in an easily detachable manner and thus facilitate replacements or repairs if at any time necessary.

Referring now to Figs. 8, 1- and 5, it will be seen that the arrangement is generally similar to that shown in Fi s. 1 and 2 with the exception that the bucket wheel comprises two sets of blades, one set being acted upon by steam from the blower ring 11 in the same manner as described with reference to Figs. 1 and 2, the other set being acted upon by exhaust steam from the blast pipe. This second set of blades 22 radiate toward the center of the blast pipe from the inner periphery of the inner ring 17 of the bucket wheel and are as shown set at the same inclination and, as shown in Fig. 5, in the same plane as the blades 16. It is desirable that the blades 22 do not throttle the blast pipe orifice and tend to cause back pressure to the cylinder exhausts and it will be observed from Fig. 3 that they are placed a suitable distance from the blast pipe mouth and only project over the latter sufliciently to be operated upon by the exhaust escaping from the blast pipe opening 12 at the usual angle. The blades 16 and 22 niaar rae and the inner and outer bucket wheel rings 17 and 18 are clearly shown in Fig.5, from which it will beseen that the inner ring 17 is carried higher than the outer ring 18 so that the lower ends or edges of the blades 22 are at a greater distance above the blast pipe top than the corresponding edges of the blades 16; the blades 16 may be elongated as shown to provide eiiicient support to the said inner ring 17 with its inwardly radiating blades 22. Furthermore if it be found desirable a further ring may be added and suitably secured to or formed with the inner edges of the blades 22 so as to inclose them in a similar manner to the blades 16.

As shown in Figs. 3 and 4 the driving or propelling device and spark arrester framing are formed in one but it will be understood that the bucket wheel may be attached to the framing in a similar manner to that described with reference to Figs. 1 and 2. Furthermore in Figs. 1 and 2 the stay portions 6 are formed as inclined driving blades adapted to be acted upon by the exhaust from the blast pipe and so revolve the spark arrester, but in the arrangement shown in Figs. 3 and 4; this is not necessary as the blast pipe exhaust acts upon the blade 22 of the bucket wheel to revolve the spark arrester and accordingly in the latter arrangement the stays 6 may be of any suitable shape; preferably the stays 6 in Fig. 3 would be triangular in shape similar to the stays 2.

it will also be understood that the form or pitch and dimensions of the blades 16 and 22 would be such as to avoid objectionable interference with the free escape of exhaust steam from the blast pipe.

lt has been found in practice, especially where wood fuel or other soft or relatively soft or light fuel is employed, that when an engine has been standing for some time an accumulation of light live ashes remains in the smoke tubes of the boiler and also scattered over the smoke box, with the result that when the blower is suddenly brought into act-ion, as for raising steam to start the engine, an objectionable quantity of these ashes are ejected through the chimney. It is necessary that the spark arrester should quickly attain sufficient peripheral speed to prevent the ejection of these small cinders. and sparks to an objectionable extent, and the driving device according to this invention, with its multiplicity of driving blades in an annular series close to the top of the blower ring and blast pipe orifice, is such as to prevent or at all events to reduce to a minimum such ejection of small live cinders and sparks.

Further the invention provides adriving or propelling device of simple construction and adapted to be readily applied to a rotary spark arrester' of the type hercinbcii'ore mentioned.

It is to be understood that we make no broad claim herein to arotary spark arrester in'which a number of driving or, propelling blades or vanes is situated within and wholly or mainly at or in the lower part of the spark arrester in proximity to "the upper or steam" outlet end of the blast pipe, such a construction and arrangement having been already described, shown and claimed in the aforesaid prior specification of United States Patent No. 1,264,865 granted April so, 1918.

What we claim as our invention and desire to secure by Letters Patent is 1. The combination, with a blast pipe having a central opening for the exhaust and an annular chamber for steam encircling the said opening and provided with steam jet holes, of a revoluble driven means arranged above the said blast pipe, and two rings spaced apart and secured to the lower end portion of the driven means and pro vided with propeller blades extending across the space between the rings in the path of the steam which. issues from the jet holes.

2. The combination, with a blast pipe having a central opening for the exhaust and an annular chamber for steam encircling the said opening and provided with two series of steam jet holes arranged at different distances from the said opening, of a revolublc driven means arranged above the said blast pipe, and propeller blades secured to the driven means and arranged in the path of the steam which issues from one series of jet holes and clear of the path of the steam which issues from the other series of jet holes.

3. The combination with a blast pipe having a central opening for the exhaust and a chamber for steam arranged around the said opening and provided with steam jet holes, of a revoluble driven means arranged above the said blast pipe, propeller blades secured. to the driven means and arranged in the path of the steam which issues from the said jet holes, and additional propeller blades secured adjacent to the aforesaid blades and arranged to be actuated by the exhaust steam which issues from the said central opening.

1. The combination, with a blast pipe having a central opening for the exhaust and an annular chamber for steam encircling the opening and provided with two series of steam jet holes arranged at different distances from the said opening, of a revoluble driven means arranged abpve the said blast pipe, and a ring secured to the lower part of the driven means and provided with a series of: propeller blades which In testimony whereof we have afiixed our pro]ect laterally from one side of the ring signatures, in presence of two witnesses.

into the path of the steam which issues PEDRO GELESTINO SAOOAGGIO. from one series of jet holes, said ring and FEDERIOO ALEJANDRO LAGRANGE. blades being arranged clear of the path of Witnesses:

the steam which issues from the other series W. F. VVALKER,

of jet holes. J. E. BUCHANAN.

copies of this patent may be obtained for five cents each by addressing the "Commissioner of Patents,

Washington, D. 0. 

